Which statement about the Magellanic Clouds is false?
A) They contain regions of rapid star formation.
B) They are companions of the Milky Way.
C) They are close to the south pole of the sky.
D) They are the two closest galaxies to us.
E) They are both irregular galaxies.
D
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Given that the binding energy of the hydrogen atom in its ground state is -13.6 eV, what is the energy when it is in the n = 5 state?
A) -2.72 eV B) 0.544 eV C) -0.544 eV D) 2.72 eV
Evidence that the cosmic background radiation really is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Bang and comparing these predictions with observations
Four of the five statements below are real. Which one is fictitious? A) The cosmic background radiation is expected to have a temperature just a few degrees above absolute zero, and its actual temperature turns out to be about 3 K (actually 2.7 K). B) The cosmic background radiation is expected to have a perfect thermal spectrum, and observations from the COBE spacecraft verify this prediction. C) The cosmic background radiation is expected to contain spectral lines of hydrogen and helium, and it does. D) The cosmic background radiation is expected to look essentially the same in all directions, and it does. E) The cosmic background radiation is expected to have tiny temperature fluctuations at the level of about 1 part in 100,000. Such fluctuations were found in the COBE data.
In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be
a. 630 nm. b. less than 630 nm. c. more than 630 nm. d. unpredictable.
If an atom emits a photon, that photon must have a wavelength ________.
A. that corresponds to the energy difference between two orbitals B. as long as the distance between two orbitals C. shorter than the absorbed photon that caused the emission D. that corresponds to the lowest energy level of that atom E. that corresponds to twice the energy difference between two orbitals